<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body{
            background-color: #eee;
        }
        *{
            padding: 0;
            margin: 0;
        }
        .slide{
            width: 234px;
            height: 420px;
            background-color: rgba(105, 101, 101, 0.6);
            padding: 20px 0;
            margin: 100px;
            position: relative;
        }
        .slide ul{
            list-style: none;
        }
        .slide ul li{
            width: 100%;
            height: 42px;
            line-height: 42px;
            text-align: left;
            padding-left: 30px;
            box-sizing: border-box;
        }
        .slide ul li a{
            display: inline-block;
            text-decoration: none;
            color: white;
        }
        .slide ul li:hover{
            background-color: #ff6700;

        }
        .slide-list{
            width: 992px;
            height: 460px;
            background-color: white;
            position: absolute;
            top: 0;
            left: 234px;
            border: 1px solid;
            border-left: none;
            box-shadow: 0 8px 16px rgba(0,0,0,0.18);
            display: none;
        }
        .slide ul li:hover > .slide-list{
            display: block;
        }
    </style>
</head>
<body>
    <!-- 滑动门的结构 -->
     <div class="slide">
        <ul>
            <li>
                <a href="#">手机</a>
                <div class="slide-list">小米1</div>
            </li>
            <li>
                <a href="#">电视</a>
                <div class="slide-list">小米2</div>
            </li>
            <li>
                <a href="#">电脑</a>
                <div class="slide-list">小米3</div>
            </li>
        </ul>
     </div>
</body>
</html>